2025-01-20 01:32:45 +00:00
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---
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author: usbharu
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2025-01-22 02:25:44 +00:00
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draft: false
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2025-01-20 01:32:45 +00:00
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categories:
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- 技術
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date: 2025-01-12T14:08:58+09:00
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tags:
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- Kotlin
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- ActivityPub
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- Kotlin
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- ActivityStreams
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- ActivityVocabulary
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keywords:
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- Kotlin
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- ActivityPub
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- Kotlin
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- ActivityStreams
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- ActivityVocabulary
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title: ActivityStreamsをKotlinでいい感じに扱いたい(DSL編)
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relpermalink: posts/2025-01-12/
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url: posts/2025-01-12/
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decription: ActivityStreamsをKotlinでいい感じに扱いたい(シリアライズ・DSL編)
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---
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前回([ActivityStreamsをKotlinでいい感じに扱いたい(デシリアライズ編) · usbharu - blog](https://blog.usbharu.dev/posts/2025-01-12/))デシリアライズの実装をした際にシリアライズの部分も作ってしまっていたのでDSLのついでに紹介します。
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## シリアライズ
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シリアライズというかマッピングのほうが正しいような気もする
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usbharu/activity-streams-serialization at 00dc4f7939655fb9a1c4276016040821569e4f9a
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https://github.com/usbharu/activity-streams-serialization/tree/00dc4f7939655fb9a1c4276016040821569e4f9a
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(注) CollectionはKotlinのCollectionではなくて独自のCollection
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```kotlin
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var replies: Collection?
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get() = replies()
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set(value) {
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jsonObject.setOrRemove(Properties.REPLIES, value?.json)
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}
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fun Object?.replies(objectFactory: ObjectFactory? = this?.objectFactory): Collection? {
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if (this == null) {
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return null
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}
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requireNotNull(objectFactory)
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val jsonNode = jsonObject.obtain(Properties.REPLIES)?.asArray()?.firstOrNull() ?: return null
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require(jsonNode.isObject)
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return objectFactory.create(jsonNode) as Collection
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}
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```
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シリアライズの方もデシリアライズと同じで、SetterでJsonNodeを直接弄っています。
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## DSL
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テストがすっげぇ～～～面倒なのでDSLを作り始めました。
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[DSL](https://github.com/usbharu/activity-streams-serialization/blob/00dc4f7939655fb9a1c4276016040821569e4f9a/src/test/kotlin/dev/usbharu/hideout/activitystreams/core/ObjectTest.kt#L77-L86)
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```
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val object1 = JsonLdBuilder().Note {
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attachment {
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listOf(
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Image {
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content("This is what he looks like.")
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url("http://example.org/cat.jpeg")
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})
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}
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name("Have you seen my cat?")
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}
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```
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こんな感じでオブジェクトを組み立てることができます。attachmentのlistOfをなくせるように作ることも考えたんですが、仕組みが複雑になる割にメリット無いのでやめました。
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KotlinでDSL作るのって簡単そうに見えて意外とややこしいですよね
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### 実装
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[オブジェクトの作成](https://github.com/usbharu/activity-streams-serialization/blob/00dc4f7939655fb9a1c4276016040821569e4f9a/src/main/kotlin/dev/usbharu/hideout/activitystreams/dsl/JsonLd.kt)
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```kotlin
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class JsonLdBuilder(var objectFactory: ObjectFactory = DefaultObjectFactory) {
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fun Object(block: ObjectBuilder.() -> Unit = {}): Object {
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val objectBuilder = ObjectBuilder(objectFactory, this)
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objectBuilder.block()
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return objectBuilder.Object
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}
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```
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[プロパティの設定](https://github.com/usbharu/activity-streams-serialization/blob/00dc4f7939655fb9a1c4276016040821569e4f9a/src/main/kotlin/dev/usbharu/hideout/activitystreams/dsl/ObjectBuilder.kt)
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```kotlin
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fun attachment(objectOrLink: ObjectOrLink?): ObjectBuilder {
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Object.attachment += objectOrLink ?: return this
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return this
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}
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```
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